I recently encountered the error above when I was running selenium tests.

Thanks to a post on stackoverflow I found out that clearing all files in tmp/cache in my project folder made the issue go away.

Similar to closing an opened browser window, spreewald now supports the I switch to the new browser tab step.

Info

See the Spreewald README for more cool features.

You can use it to test links that were opened with a link_to(..., :target => '_blank') link or other ways that create new tabs or windows.

Important

This only works with Selenium ...

The ipad onscreen keyboard changes position:fixed style to position:static that misplaces those elements and you'll have problems on each page with a form, e.g. search field.

There are several workarounds/hacks but no straight forward fix yet. Expect additional expense.

Did you know you can do in-place batch processing with plain ruby?

The following script will in-place replace "foo" with "bar" in all files you feed it. Call it with ./my_script path/to/my/files/*

#!ruby -i -p
$_.gsub!(/foo/, "bar")

"'-i -p" means:

Ruby will run your script once for each line in each file. The line will be placed in $_. The value of $_ at the end of your script will be written back to the file.

Shorter

Using the Kernel#gsub shorthand for $_.gsub!:

#!ruby -i -p
gsub(/foo/, "bar")

S...

Connect to your memcached host. (AWS elasticache is memcached)

telnet foohost23.cs2631.0001.euw1.cache.amazonaws.com 11211 

Once you're connected, find out which 'slabs' exist within the cache:

stats items
STAT items:1:number 3550
STAT items:1:age 5166393
STAT items:1:evicted 0
STAT items:1:evicted_nonzero 0
STAT items:1:evicted_time 0
STAT items:1:outofmemory 0
STAT items:1:tailrepairs 0
STAT items:1:reclaimed 0
STAT items:2:number 144886
STAT items:2:age 1375536
STAT items:2:evicted 0

...

Set the hash to a dummy hash which doesn't hit any id at your page, for example:

window.location.hash = "_";

Note

• If you'd set the hash to "" it causes the page to scroll to the top because the hash "#" by itself is equivalent to "_top".
• If you'd set window.location.href = "..." to get rid of the "#", you cause the browser to reload the page what is most likely not intended.

You can use xmllint to pretty-print ugly XML files on your terminal. Just say:

xmllint --format file.xml

That will restructure containers nicely into individual sections with proper indentation.\
Note that it will automagically work on gzipped XML files!

To write pretty output to a new file, just use the -o switch (short for --output):

xmllint --format file.xml -o pretty_file.xml

See the xmllint man page for other useful switches and more information.

A great and enjoyable introduction into the concept of the web and about what HTTP was designed for. The original post has been removed for some stupid gender discussion.

Rails 4.0 is finally ready after a thorough process of betas and release candidates. It's an amazing new version packed with new goodies and farewells to old features past their expiration date.

This card shows how to upgrade a Rails 2 application from Rails 2.3.8 through every single patch level up to 2.3.18, and then, hopefully, Rails LTS.

2.3.8 to 2.3.9

This release has many minor changes and fixes to prepare your application for Rails 3.

Step-by-step upgrade instructions:

0. Upgrade rails gem
1. Change your environment.rb so it says RAILS_GEM_VERSION = '2.3.9'
2. Change your ...

Active Record's select method allows you to make use of the power of MySQL select statements. On the one hand it allows you to select specific fields.

Post.select("content")

results in the following query:

"SELECT content FROM `posts`"

This means that your models will be initialized with only the content attribute and you will not be able to access any other attribute. In fact trying so would raise an ActiveRecord::MissingAttributeError error.

 Post.select("content").first.title # => ActiveRecord::MissingAttributeErr...

Here is a good explanation for zombie processes.

Quote:

If you have zombie processes it means those zombies have not been waited for by their parent (look at PPID displayed by ps -l). 
You have three choices: Fix the parent process (make it wait); kill the parent; or live with it.
Remember that living with it is not so hard because zombies take up little more than one extra line in the output of ps.

On a server I want to get informed if there are zombie processes and track them wi...

Backbone plugin to override getters and setters with logic.

ActionMailer per default uses http as protocol, which enables SSL-stripping. When a logged-in user follows an http link to your application, it sends the cookies along with it. Although the application redirects the user to https and from that point has a secure connection to the user, an attacker may overhear that first unsafe request and hijack your session.

Teach ActionMailer to use the right protocol

If your application is behind SSL, turn on using https application-wide. In your environment file (either global or per environ...

In order to have more human readable git branches, do

  git pull --rebase

To always pull like this, write these lines to your ~/.gitconfig:

[pull]
   rebase = true

..or use this oneliner

git config --global pull.rebase true

Note that this will break if you pull from other upstream branches like

git pull origin other-branch

If you keep rebasing by default, you can get "merge pulls" like this:

git pull --no-rebase origin other-branch

Put the attached files into your home directory and enjoy.

.irbrc

• defines interesting_methods, which is essentially all methods without top-level methods inherited from Object/Module
• requires awesome_print, if present
• requires interactive_editor, if present (basically makes vim available)
• loads .irbrc_rails if in Rails (e.g. for the Rails console)

.irbrc_rails

• defines efind(email), which is a shortcut to find users by email
  ...

TLDR

Do it like this:

attribute :active, Virtus::Attribute::Boolean

Long story

In Virtus you define attribute with their type like this:

attribute :name, String
attribute :birthday, Date

When defining a boolean attributes, you will probably write it like this:

attribute :active, Boolean

The problem is, there is not actually a Boolean class in Ruby (there's only TrueClass and FalseClass), so use Virtus::Attribute::Boolean instead.

The reason whil...

Capistrano recently had some API changes that can results in deploys not working when running with old deploy.rb files.

So let's bundle it. Put capistrano into your Gemfile, like this:

# Gemfile

group :deploy do
  gem 'capistrano'
  gem 'capistrano_colors'
end

It's possible you need to do a bundle update net-ssh to get things running.

Now double check that all your custom hooks are actually still called. One candidate might be an after deploy:symlink hook that has been renamed into `after deploy:creat...

Sometimes sound breaks for me and speaker output is completely broken. This helped:

pulseaudio -k && sudo alsa force-reload

Essential backports that enable many of the nice features of Ruby 1.8.7 up to 2.0.0 for earlier versions.

The Ruby on Rails security list archive can be found here: http://groups.google.com/group/rubyonrails-security

You can subscribe to this mailing list without a Google account by pasting this URL into your browser (after replacing the email address obviously).

http://groups.google.com/group/rubyonrails-security/boxsubscribe?email=your.name@example.com
                                                                       ^^^^^^^^^^^^^^^^^^^^^ <- Change this

Our development process makes us deploy very often. As the number of releases grows, junk clogs up the hard drive of our application servers:

• Old release code
• Old tmp folders with compiled view templates etc.
• Precompiled assets (Javascripts, images...) that no longer exist. When using the asset pipeline, Capistrano will symlink the public/assets directory to shared/assets. This is cool since we can still serve previous assets after a new release, in the window where browser caches might still have references to old assets. But i...